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# RSS Element * * Complete RSS Reference](#) * * * ## Definition and Usage The element specifies one or more categories to which the channel or item belongs. The element can also specify a hierarchical location in a directory (the value of the element is a string separated by forward slashes). The element allows RSS aggregators to categorize/group the directory of sites/articles (grouping sites/articles based on directories). * * * ## Attributes | Tag | Description | | --- | --- | | domain | Optional. String or URL that identifies the taxonomy of the category. Example: IT | * * * ## Example Rss TutorialRSS [Try it »](#) * * Complete RSS Reference](#)